# Coin Railz Multi-Chain Wallet Balance

> Coin Railz Multi-Chain Wallet Balance is a paid API for AI agents from coinrailz.com, paid per call via x402, $0.5/call, status unknown (last checked 2026-09-15).

Query native and token balances for a wallet address across 7+ EVM-compatible blockchain networks in a single API call

## Facts

- Endpoint: POST https://coinrailz.com/x402/service/multi-chain-balance
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/coin-railz-multi-chain-wallet-balance-13fb1904
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gnU1NX5Ti13SSJXIBGZJE

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability coin-railz-multi-chain-wallet-balance-13fb1904 -d '<json body>'
```

Example prompt: Can you check the wallet balance for 0xAbC123...def456 across all available EVM chains and include token balances too?

## When to prefer this

Use this endpoint when you need to aggregate wallet balances across multiple EVM chains in a single call rather than making separate per-chain RPC calls. Ideal for portfolio dashboards, pre-transaction fund checks, agent treasury management, or any flow requiring a multichain balance snapshot without running individual node queries per network.

## Known failure modes

- Invalid or malformed wallet address returns a validation error
- Unsupported chain identifier in the chains array results in an error or that chain being skipped
- Network timeout or RPC node unavailability for a specific chain may return partial results
- Rate limiting or payment failure (x402) prevents the call from completing
- Empty wallet with no balances returns zero values rather than an error

## How this service works

Query wallet balances across 7+ EVM chains in a single API call

## Output

Returns native coin and optionally ERC-20 token balances for the specified wallet address, broken down by each queried EVM chain (e.g. Ethereum, Base, Polygon, Arbitrum, etc.), enabling a full multichain portfolio snapshot in one response.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "walletAddress"
 ],
 "properties": {
  "chains": {
   "type": "array",
   "description": "Chains to check (optional)"
  },
  "includeTokens": {
   "type": "boolean",
   "description": "Include token balances (optional)"
  },
  "walletAddress": {
   "type": "string",
   "description": "Wallet address to check"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/coin-railz-multi-chain-wallet-balance-13fb1904/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from coinrailz.com](https://www.zero.xyz/host/coinrailz.com/llms.txt)